WO2015012507A1 - Procédé d'émission/réception pour appareil mtc - Google Patents

Procédé d'émission/réception pour appareil mtc Download PDF

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Publication number
WO2015012507A1
WO2015012507A1 PCT/KR2014/005950 KR2014005950W WO2015012507A1 WO 2015012507 A1 WO2015012507 A1 WO 2015012507A1 KR 2014005950 W KR2014005950 W KR 2014005950W WO 2015012507 A1 WO2015012507 A1 WO 2015012507A1
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Prior art keywords
subframe
mtc
base station
mtc device
crs
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PCT/KR2014/005950
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English (en)
Korean (ko)
Inventor
유향선
서동연
이윤정
안준기
양석철
Original Assignee
엘지전자 주식회사
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Priority to US14/906,964 priority Critical patent/US10375529B2/en
Publication of WO2015012507A1 publication Critical patent/WO2015012507A1/fr
Priority to US16/447,523 priority patent/US10863320B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present invention relates to mobile communications.
  • 3GPP LTE long term evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink and single carrier-frequency division multiple access (SC-FDMA) in uplink.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • MIMO multiple input multiple output
  • LTE-A 3GPP LTE-Advanced
  • the physical channel in LTE is a downlink channel PDSCH (Physical Downlink) It may be divided into a shared channel (PDCCH), a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) which are uplink channels.
  • PDSCH Physical Downlink
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • MTC Machine Type Communication
  • the service optimized for MTC communication may be different from the service optimized for human to human communication.
  • MTC communication has different market scenarios, data communication, low cost and effort, potentially very large number of MTC devices, wide service area and Low traffic (traffic) per MTC device may be characterized.
  • the MTC device is expected to have a low performance in order to increase the penetration rate at a low cost, when transmitting a PDCCH or PDSCH as transmitted to a general terminal, the MTC device located in the coverage extension region of the cell is difficult to receive it Can suffer.
  • the present disclosure aims to solve the above-mentioned problem.
  • a Machine Type Communication (MTC) device when located in a coverage extension area of a base station, the base station repeatedly transmits a PDCCH or PDSCH on several subframes (that is, a bundle transmission). Make sure you do it.
  • MTC Machine Type Communication
  • the method of transmitting and receiving the MTC device includes the step of receiving, by the MTC device, configuration information for a multicast-broadcast single-frequency network (MBSFN) subframe from a base station; Receiving, by the MTC device, downlink data for itself on a data area of the MBSFN subframe;
  • the MTC device may include receiving a cell-specific reference signal (CRS) only on a resource block (RB) of a part of the total system bandwidth of a data region of the MBSFN subframe.
  • CRS cell-specific reference signal
  • RB resource block
  • the CRS received only on the part of the RB may be transmitted by increasing power by the base station.
  • the method of transmitting / receiving the MTC device may further include recognizing the MBSFN subframe as a dedicated subframe for MTC.
  • the method of transmitting / receiving the MTC device may further include receiving a physical downlink control channel (PDCCH) including scheduling information for downlink data for the self on the control region of the MBSFN subframe.
  • a physical downlink control channel (PDCCH) including scheduling information for downlink data for the self on the control region of the MBSFN subframe.
  • the method of transmitting and receiving the MTC device may further include receiving downlink data for itself in a data region of a general subframe instead of the MBSFN subframe.
  • the base station transmits and receives a method comprising: transmitting configuration information on a multicast-broadcast single-frequency network (MBSFN) subframe; Scheduling, by the base station, radio resources for a general terminal on a general subframe except for an MBSFN subframe, and scheduling radio resources for a machine type communication (MTC) device on the general subframe and the MBSFN subframe;
  • MCS machine type communication
  • the base station transmits a cell-specific reference signal (CRS) on the entire system bandwidth in the control region of the MBSFN subframe, but transmits the CRS only on a resource block (RB) of a part of the entire system bandwidth in the data region. It may include.
  • the CRS on the part of the RB may be transmitted with increased power.
  • the transmitting and receiving method of the base station comprises the steps of the base station to transmit the downlink control information including scheduling information for the downlink data for the MTC device on the control region of the MBSFN subframe;
  • the base station may further include transmitting downlink data for the MTC device on the data area of the MBSFN subframe.
  • the MTC device includes a processor; Controlled by the processor, when receiving configuration information on a multicast-broadcast single-frequency network (MBSFN) subframe from a base station, receiving downlink data for itself on the data area of the MBSFN subframe according to the configuration information And a transceiver for receiving a cell-specific reference signal (CRS) only on a resource block (RB) of a part of the overall system bandwidth of the data region of the MBSFN subframe.
  • CRS cell-specific reference signal
  • RB resource block
  • the base station includes a transceiver for transmitting configuration information for a multicast-broadcast single-frequency network (MBSFN) subframe;
  • a radio resource for a general terminal may be scheduled on a general subframe except for an MBSFN subframe, and a radio resource for a machine type communication (MTC) device may include a processor scheduling on the general subframe and the MBSFN subframe.
  • the transceiver transmits a CRS (Cell-specific Reference Signal) on the entire system bandwidth in the control region of the MBSFN subframe, and transmits a transmission CRS only on a resource block (RB) of a part of the entire system bandwidth in the data region.
  • CRS on some RBs can transmit with increased power.
  • MTC machine type communication
  • 1 is a wireless communication system.
  • FIG. 2 shows a structure of a radio frame according to FDD in 3GPP LTE.
  • 3 shows a structure of a downlink radio frame according to TDD in 3GPP LTE.
  • FIG. 4 is an exemplary diagram illustrating a resource grid for one uplink or downlink slot in 3GPP LTE.
  • 5 shows a structure of a downlink subframe.
  • FIG. 6 shows a structure of an uplink subframe in 3GPP LTE.
  • FIG. 7 is a comparative example of a single carrier system and a carrier aggregation system.
  • FIG. 8 illustrates cross-carrier scheduling in a carrier aggregation system.
  • MTC 10A illustrates an example of machine type communication (MTC) communication.
  • MTC machine type communication
  • 10B is an illustration of cell coverage extension for an MTC device.
  • FIG. 11 is an exemplary diagram illustrating a subframe in which an MTC device located in a coverage extension area can receive downlink data.
  • FIG. 12 is an exemplary diagram illustrating an area in which a CRS is transmitted for an MTC device located in a coverage extension area.
  • FIG. 13 is a diagram illustrating a region in which a PDSCH is transmitted for an MTC device located in a coverage extension region.
  • 14A and 14B illustrate an example of repeatedly transmitting a bundle of PBCHs for an MTC device located in a coverage extension area.
  • 15 is an exemplary diagram illustrating a resource for transmitting a CRS.
  • 16 is a block diagram illustrating a wireless communication system in which the present disclosure is implemented.
  • LTE includes LTE and / or LTE-A.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • base station which is used hereinafter, generally refers to a fixed station for communicating with a wireless device, and includes an evolved-nodeb (eNodeB), an evolved-nodeb (eNB), a base transceiver system (BTS), and an access point (e.g., a fixed station). Access Point) may be called.
  • eNodeB evolved-nodeb
  • eNB evolved-nodeb
  • BTS base transceiver system
  • access point e.g., a fixed station.
  • UE User Equipment
  • MS mobile station
  • UT user terminal
  • SS subscriber station
  • MT mobile terminal
  • 1 is a wireless communication system.
  • a wireless communication system includes at least one base station (BS) 20.
  • Each base station 20 provides a communication service for a particular geographic area (generally called a cell) 20a, 20b, 20c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • the UE typically belongs to one cell, and the cell to which the UE belongs is called a serving cell.
  • a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
  • a base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are determined relatively based on the UE.
  • downlink means communication from the base station 20 to the UE 10
  • uplink means communication from the UE 10 to the base station 20.
  • the transmitter may be part of the base station 20 and the receiver may be part of the UE 10.
  • the transmitter may be part of the UE 10 and the receiver may be part of the base station 20.
  • the wireless communication system includes a multiple-input multiple-output (MIMO) system, a multiple-input single-output (MIS) system, a single-input single-output (SISO) system, and a single-input multiple-output (SIMO) system.
  • MIMO multiple-input multiple-output
  • MIS multiple-input single-output
  • SISO single-input single-output
  • SIMO single-input multiple-output
  • the MIMO system uses a plurality of transmit antennas and a plurality of receive antennas.
  • the MISO system uses multiple transmit antennas and one receive antenna.
  • the SISO system uses one transmit antenna and one receive antenna.
  • the SIMO system uses one transmit antenna and multiple receive antennas.
  • the transmit antenna means a physical or logical antenna used to transmit one signal or stream
  • the receive antenna means a physical or logical antenna used to receive one signal or stream.
  • a wireless communication system can be largely divided into a frequency division duplex (FDD) method and a time division duplex (TDD) method.
  • FDD frequency division duplex
  • TDD time division duplex
  • uplink transmission and downlink transmission are performed while occupying different frequency bands.
  • uplink transmission and downlink transmission are performed at different times while occupying the same frequency band.
  • the channel response of the TDD scheme is substantially reciprocal. This means that the downlink channel response and the uplink channel response are almost the same in a given frequency domain. Therefore, in a TDD based wireless communication system, the downlink channel response can be obtained from the uplink channel response.
  • the downlink transmission by the base station and the uplink transmission by the UE cannot be performed at the same time.
  • uplink transmission and downlink transmission are performed on different subframes.
  • FIG. 2 shows a structure of a radio frame according to FDD in 3GPP LTE.
  • the radio frame illustrated in FIG. 2 may refer to section 5 of 3GPP TS 36.211 V10.4.0 (2011-12) "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10)".
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • Physical Channels and Modulation Release 10
  • a radio frame includes 10 subframes, and one subframe includes two slots. Slots in a radio frame are numbered from 0 to 19 slots.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI may be referred to as a scheduling unit for data transmission.
  • one radio frame may have a length of 10 ms
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
  • one slot may include a plurality of OFDM symbols. How many OFDM symbols are included in one slot may vary depending on a cyclic prefix (CP).
  • CP cyclic prefix
  • 3 shows a structure of a downlink radio frame according to TDD in 3GPP LTE.
  • the radio frame includes 10 subframes indexed from 0 to 9.
  • One subframe includes two consecutive slots.
  • one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain.
  • OFDM symbol is only for representing one symbol period in the time domain, since 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink (DL), multiple access scheme or name There is no limit on.
  • OFDM symbol may be called another name such as a single carrier-frequency division multiple access (SC-FDMA) symbol, a symbol period, and the like.
  • SC-FDMA single carrier-frequency division multiple access
  • One slot includes 7 OFDM symbols as an example, but the number of OFDM symbols included in one slot may vary according to the length of the CP.
  • One slot in a normal CP includes 7 OFDM symbols, and one slot in an extended CP includes 6 OFDM symbols.
  • a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 ⁇ 12 resource elements (REs). It may include.
  • a subframe having indexes # 1 and # 6 is called a special subframe and includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS is used for initial cell search, synchronization or channel estimation at the UE.
  • UpPTS is used to synchronize channel estimation at the base station with uplink transmission synchronization of the UE.
  • GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • DL subframe In TDD, a downlink (DL) subframe and an uplink (UL) subframe coexist in one radio frame.
  • Table 1 shows an example of configuration of a radio frame.
  • 'D' represents a DL subframe
  • 'U' represents a UL subframe
  • 'S' represents a special subframe.
  • the UE may know which subframe is the DL subframe or the UL subframe according to the configuration of the radio frame.
  • the DL (downlink) subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
  • PDCCH and other control channels are allocated to the control region, and PDSCH is allocated to the data region.
  • FIG. 4 is an exemplary diagram illustrating a resource grid for one uplink or downlink slot in 3GPP LTE.
  • an uplink slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and NRB resource blocks (RBs) in a frequency domain.
  • OFDM orthogonal frequency division multiplexing
  • RBs resource blocks
  • the number of resource blocks (RBs), that is, NRBs may be any one of 6 to 110.
  • an exemplary resource block includes 7 ⁇ 12 resource elements including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of subcarriers and the OFDM symbols in the resource block is equal to this. It is not limited.
  • the number of OFDM symbols or the number of subcarriers included in the resource block may be variously changed. That is, the number of OFDM symbols may change according to the length of the above-described CP.
  • 3GPP LTE defines that 7 OFDM symbols are included in one slot in the case of a normal CP, and 6 OFDM symbols are included in one slot in the case of an extended CP.
  • the OFDM symbol is for representing one symbol period, and may be referred to as an SC-FDMA symbol, an OFDMA symbol, or a symbol period according to a system.
  • the RB includes a plurality of subcarriers in the frequency domain in resource allocation units.
  • the number NUL of resource blocks included in an uplink slot depends on an uplink transmission bandwidth set in a cell.
  • Each element on the resource grid is called a resource element (RE).
  • the number of subcarriers in one OFDM symbol can be used to select one of 128, 256, 512, 1024, 1536 and 2048.
  • a resource grid for one uplink slot may be applied to a resource grid for a downlink slot.
  • 5 shows a structure of a downlink subframe.
  • 7 OFDM symbols are included in one slot by assuming a normal CP.
  • the number of OFDM symbols included in one slot may change according to the length of the CP. That is, as described above, according to 3GPP TS 36.211 V10.4.0, one slot includes 7 OFDM symbols in a normal CP, and one slot includes 6 OFDM symbols in an extended CP.
  • a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block may include 7 ⁇ 12 resource elements (RE). have.
  • the DL (downlink) subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
  • a physical downlink control channel (PDCCH) and another control channel are allocated to the control region, and a PDSCH is allocated to the data region.
  • PDCH physical downlink control channel
  • physical channels include a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid (PHICH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • PDCCH physical downlink control channel
  • PCFICH physical control format indicator channel
  • PHICH physical hybrid
  • ARQ Indicator Channel Physical Uplink Control Channel
  • the PCFICH transmitted in the first OFDM symbol of a subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of a control region) used for transmission of control channels in the subframe.
  • CFI control format indicator
  • the wireless device first receives the CFI on the PCFICH and then monitors the PDCCH.
  • the PCFICH does not use blind decoding and is transmitted on a fixed PCFICH resource of a subframe.
  • the PHICH carries a positive-acknowledgement (ACK) / negative-acknowledgement (NACK) signal for a UL hybrid automatic repeat request (HARQ).
  • ACK positive-acknowledgement
  • NACK negative-acknowledgement
  • HARQ UL hybrid automatic repeat request
  • the Physical Broadcast Channel (PBCH) is transmitted in the preceding four OFDM symbols of the second slot of the first subframe of the radio frame.
  • the PBCH carries system information necessary for the wireless device to communicate with the base station, and the system information transmitted through the PBCH is called a master information block (MIB).
  • MIB master information block
  • SIB system information block
  • the PDCCH includes resource allocation and transmission format of downlink-shared channel (DL-SCH), resource allocation information of uplink shared channel (UL-SCH), paging information on PCH, system information on DL-SCH, and random access transmitted on PDSCH. Resource allocation of higher layer control messages such as responses, sets of transmit power control commands for individual UEs in any UE group, activation of voice over internet protocol (VoIP), and the like.
  • a plurality of PDCCHs may be transmitted in the control region, and the UE may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs).
  • CCEs control channel elements
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • DCI downlink control information
  • PDSCH also called DL grant
  • PUSCH resource allocation also called UL grant
  • VoIP Voice over Internet Protocol
  • the base station determines the PDCCH format according to the DCI to be sent to the UE, and attaches a cyclic redundancy check (CRC) to the control information.
  • CRC cyclic redundancy check
  • the CRC masks a unique radio network temporary identifier (RNTI) according to the owner or purpose of the PDCCH. If the PDCCH is for a specific UE, a unique identifier of the UE, for example, a cell-RNTI (C-RNTI) may be masked to the CRC. Alternatively, if the PDCCH is for a paging message, a paging indication identifier, for example, p-RNTI (P-RNTI), may be masked to the CRC.
  • RNTI radio network temporary identifier
  • SI-RNTI system information-RNTI
  • RA-RNTI random access-RNTI
  • blind decoding is used to detect the PDCCH.
  • Blind decoding is a method of demasking a desired identifier in a cyclic redundancy check (CRC) of a received PDCCH (referred to as a candidate PDCCH) and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
  • the base station determines the PDCCH format according to the DCI to be sent to the wireless device, attaches the CRC to the DCI, and masks a unique identifier (RNTI) to the CRC according to the owner or purpose of the PDCCH.
  • RNTI unique identifier
  • the uplink channel includes a PUSCH, a PUCCH, a sounding reference signal (SRS), and a physical random access channel (PRACH).
  • PUSCH PUSCH
  • PUCCH Physical Uplink Control Channel
  • SRS sounding reference signal
  • PRACH physical random access channel
  • FIG. 6 shows a structure of an uplink subframe in 3GPP LTE.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) for transmitting uplink control information is allocated to the control region.
  • the data area is allocated a PUSCH (Physical Uplink Shared Channel) for transmitting data (in some cases, control information may also be transmitted).
  • PUSCH Physical Uplink Shared Channel
  • PUCCH for one UE is allocated to an RB pair on a subframe.
  • Resource blocks belonging to a resource block pair occupy different subcarriers in each of a first slot and a second slot.
  • the frequency occupied by RBs belonging to the RB pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • the UE may obtain frequency diversity gain by transmitting uplink control information through different subcarriers over time.
  • m is a location index indicating a logical frequency domain location of a resource block pair allocated to a PUCCH in a subframe.
  • the uplink control information transmitted on the PUCCH includes a hybrid automatic repeat request (HARQ) acknowledgment (ACK) / non-acknowledgement (NACK), a channel quality indicator (CQI) indicating a downlink channel state, and an uplink radio resource allocation request. (scheduling request).
  • HARQ hybrid automatic repeat request
  • ACK acknowledgment
  • NACK non-acknowledgement
  • CQI channel quality indicator
  • the PUSCH is mapped to the UL-SCH, which is a transport channel.
  • the uplink data transmitted on the PUSCH may be a transport block which is a data block for the UL-SCH transmitted during the transmission time interval (TTI).
  • the transport block may be user information.
  • the uplink data may be multiplexed data.
  • the multiplexed data may be a multiplexed transport block and control information for the UL-SCH.
  • control information multiplexed with data may include a CQI, a precoding matrix indicator (PMI), a HARQ, a rank indicator (RI), and the like.
  • the uplink data may consist of control information only.
  • FIG. 7 is a comparative example of a single carrier system and a carrier aggregation system.
  • a single carrier in uplink and downlink.
  • the bandwidth of the carrier may vary, but only one carrier is allocated to the UE.
  • a carrier aggregation (CA) system a plurality of component carriers (DL CC A to C, UL CC A to C) may be allocated to the UE.
  • a component carrier (CC) refers to a carrier used in a carrier aggregation system and may be abbreviated as a carrier. For example, three 20 MHz component carriers may be allocated to allocate a 60 MHz bandwidth to the UE.
  • the carrier aggregation system may be divided into a contiguous carrier aggregation system in which aggregated carriers are continuous and a non-contiguous carrier aggregation system in which aggregated carriers are separated from each other.
  • a carrier aggregation system simply referred to as a carrier aggregation system, it should be understood to include both the case where the component carrier is continuous and the case where it is discontinuous.
  • the number of component carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink CCs and the number of uplink CCs are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
  • the target carrier may use the bandwidth used by the existing system as it is for backward compatibility with the existing system.
  • the 3GPP LTE system supports bandwidths of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz, and the 3GPP LTE-A system may configure a bandwidth of 20 MHz or more using only the bandwidth of the 3GPP LTE system.
  • broadband can be configured by defining new bandwidth without using the bandwidth of the existing system.
  • the system frequency band of a wireless communication system is divided into a plurality of carrier frequencies.
  • the carrier frequency means a center frequency of a cell.
  • a cell may mean a downlink frequency resource and an uplink frequency resource.
  • the cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource.
  • CA carrier aggregation
  • the UE In order to transmit and receive packet data through a specific cell, the UE must first complete configuration for a specific cell.
  • the configuration refers to a state in which reception of system information necessary for data transmission and reception for a corresponding cell is completed.
  • the configuration may include a general process of receiving common physical layer parameters required for data transmission and reception, media access control (MAC) layer parameters, or parameters required for a specific operation in the RRC layer.
  • MAC media access control
  • the cell in the configuration complete state may exist in an activation or deactivation state.
  • activation means that data is transmitted or received or is in a ready state.
  • the UE may monitor or receive the control channel (PDCCH) and the data channel (PDSCH) of the activated cell in order to identify resources allocated to the UE (which may be frequency, time, etc.).
  • PDCCH control channel
  • PDSCH data channel
  • Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible.
  • the UE may receive system information (SI) required for packet reception from the deactivated cell.
  • SI system information
  • the UE does not monitor or receive the control channel (PDCCH) and the data channel (PDSCH) of the deactivated cell in order to check resources allocated to it (may be frequency, time, etc.).
  • the cell may be divided into a primary cell, a secondary cell, and a serving cell.
  • a primary cell means a cell operating at a primary frequency, and is a cell in which a UE performs an initial connection establishment procedure or a connection reestablishment procedure with a base station, or is indicated as a primary cell in a handover process. It means a cell.
  • the secondary cell refers to a cell operating at the secondary frequency, and is established and used to provide additional radio resources once the RRC connection is established.
  • the serving cell is configured as a primary cell when the carrier aggregation is not set or the UE cannot provide carrier aggregation.
  • the term serving cell indicates a cell configured for the UE and may be configured in plural.
  • One serving cell may be configured with one downlink component carrier or a pair of ⁇ downlink component carrier, uplink component carrier ⁇ .
  • the plurality of serving cells may be configured as a set consisting of one or a plurality of primary cells and all secondary cells.
  • a plurality of CCs that is, a plurality of serving cells, may be supported.
  • Such a carrier aggregation system may support cross-carrier scheduling.
  • Cross-carrier scheduling is a resource allocation of a PDSCH transmitted on another component carrier through a PDCCH transmitted on a specific component carrier and / or other components other than the component carrier basically linked with the specific component carrier.
  • a scheduling method for resource allocation of a PUSCH transmitted through a carrier That is, the PDCCH and the PDSCH may be transmitted through different downlink CCs, and the PUSCH may be transmitted through another uplink CC other than the uplink CC linked with the downlink CC through which the PDCCH including the UL grant is transmitted. .
  • a carrier indicator indicating a DL CC / UL CC through which a PDSCH / PUSCH for which PDCCH provides control information is transmitted is required.
  • a field containing such a carrier indicator is hereinafter called a carrier indication field (CIF).
  • a carrier aggregation system supporting cross carrier scheduling may include a carrier indication field (CIF) in a conventional downlink control information (DCI) format.
  • CIF carrier indication field
  • DCI downlink control information
  • 3 bits may be extended, and the PDCCH structure may include an existing coding method, Resource allocation methods (ie, CCE-based resource mapping) can be reused.
  • FIG. 8 illustrates cross-carrier scheduling in a carrier aggregation system.
  • the base station may set a PDCCH monitoring DL CC (monitoring CC) set.
  • the PDCCH monitoring DL CC set is composed of some DL CCs among the aggregated DL CCs, and when cross-carrier scheduling is set, the UE performs PDCCH monitoring / decoding only for the DL CCs included in the PDCCH monitoring DL CC set. In other words, the base station transmits the PDCCH for the PDSCH / PUSCH to be scheduled only through the DL CC included in the PDCCH monitoring DL CC set.
  • PDCCH monitoring DL CC set may be set UE-specific, UE group-specific, or cell-specific.
  • three DL CCs (DL CC A, DL CC B, and DL CC C) are aggregated, and DL CC A is set to PDCCH monitoring DL CC.
  • the UE may receive the DL grant for the PDSCH of the DL CC A, the DL CC B, and the DL CC C through the PDCCH of the DL CC A.
  • the DCI transmitted through the PDCCH of the DL CC A may include the CIF to indicate which DCI the DLI is.
  • the system information is divided into a master information block (MIB) and a plurality of system information blocks (SIB).
  • the MIB contains the most important physical layer information of the cell.
  • SIB includes information used to evaluate whether the UE is allowed to access the cell, and also includes other types of scheduling information of the SIB.
  • the second type of SIB (SIB Type 2) contains common and shared channel information.
  • SIB Type 3 contains cell reselection information primarily associated with the serving cell.
  • a fourth type of SIB (SIB type 4) includes frequency information of a serving cell and intra frequency information of a neighbor cell associated with cell reselection.
  • the fifth type of SIB includes information on other E-UTRA frequencies and information on inter frequencies of neighboring cells related to cell reselection.
  • a sixth type of SIB includes information on UTRA frequency and information on a UTRA neighbor cell related to cell reselection.
  • a seventh type of SIB includes information on GERAN frequencies related to cell reselection.
  • the MIB is delivered to the UE 10 on the PBCH.
  • SIB type 1 the first type SIB (SIB type 1) DL-SCH and delivered to the UE 10 on the PDSCH.
  • SIB type 2 the first type SIB
  • SIB type 3 the second type SIB
  • SIB type 3 the first type SIB
  • SIB type 3 the second type SIB
  • MTC 10A illustrates an example of machine type communication (MTC) communication.
  • MTC machine type communication
  • Machine Type Communication is an exchange of information through the base station 200 between MTC devices 100 without human interaction or information through a base station between the MTC device 100 and the MTC server 700. Say exchange.
  • the MTC server 700 is an entity that communicates with the MTC device 100.
  • the MTC server 700 executes an MTC application and provides an MTC specific service to the MTC device.
  • the MTC device 100 is a wireless device that provides MTC communication and may be fixed or mobile.
  • the services offered through MTC are different from those in existing human-involved communications, and there are various categories of services such as tracking, metering, payment, medical services, and remote control. exist. More specifically, services provided through the MTC may include meter reading, level measurement, utilization of surveillance cameras, inventory reporting of vending machines, and the like.
  • the uniqueness of the MTC device is that the amount of data transmitted is small and the up / down link data transmission and reception occur occasionally. Therefore, it is effective to lower the cost of the MTC device and reduce battery consumption in accordance with such a low data rate.
  • the MTC device is characterized by low mobility, and thus has a characteristic that the channel environment hardly changes.
  • 10B is an illustration of cell coverage extension for an MTC device.
  • one disclosure of the present specification repeatedly transmits on several subframes (for example, a bundle subframe) when a base station transmits a PDSCH and a PDCCH to an MTC device located in a coverage extension region.
  • the MTC device may increase a decoding success rate by receiving a bundle of PDCCHs through various subframes and decoding the bundle of PDCCHs. That is, the PDCCH can be successfully decoded using some or all of the bundles of the PDCCHs received through various subframes.
  • the MTC device may increase a decoding success rate by receiving a bundle of PDSCHs through various subframes and decoding some or all of the bundles of PDSCHs.
  • the MTC device located in the coverage extension region may also transmit a PUCCH bundle through various subframes.
  • the MTC device may transmit a bundle of PUSCHs through various subframes.
  • an MTC device located in a coverage extension area is referred to as a coverage enhancement (CE) MTC device, and an MTC device not located in the coverage extension area is referred to as a non-CE MTC device.
  • CE coverage enhancement
  • TDM time division multiplexing
  • the base station of the cell transmits downlink data on a multicast-broadcast single-frequency network (MBSFN) subframe to a CE MTC device, and a general subframe other than the MBSFN subframe to a non-CE MTC device. That is, downlink data may be transmitted on a non-MBSFN subframe.
  • MBSFN multicast-broadcast single-frequency network
  • a 10msec radio frame may be divided into an MBSFN subframe and a non-MBSFN subframe.
  • the MTC device or the UE can receive the SIB from the base station of the cell to know the location of the MBSFN subframe of the cell.
  • the subframe When the base station of the cell transmits downlink data to a CE MTC device, the subframe is called a CE MTC subframe, the CE MTC subframe is the MBSFN subframe that the base station of the cell provides services to the existing general UE; It can always be the same. Therefore, when the CE MTC device obtains information on the location of the MBSFN subframe from the base station, it can be assumed that the MBSFN subframe is a CE MTC subframe.
  • the CE MTC subframe may include not only the MBSFN subframe but also non-MBSFN subframe, or may include only the non-MBSFN subframe.
  • the CE MTC device may receive a control channel / data channel and a reference signal (RS) even on a non-MBSFN subframe, and may also receive on a CE MTC subframe.
  • a CE MTC device may receive a cell-specific or cell-common control channel / data channel on a non-MBSFN subframe, and separate on a CE MTC subframe (or MBSFN subframe).
  • a UE-specific control channel / data channel can be received.
  • the CE MTC subframe includes the non-MBSFN subframe
  • the CE MTC device may also receive a UE-specific control channel / data channel on the non-MBSFN subframe. May
  • the CE MTC subframe may include all or some subframes of the MBSFN subframe. Can be.
  • the MBSFN subframe includes subframes 1, 2, 3, 6, 7, and 8, but the CE MTC subframe in which the CE MTC device can receive data is a subframe. It can consist only of 1, 2, 6, and 7.
  • the base station of the cell may inform the existing general UE or the CE MTC device which subframes of the MBSFN subframes are used as the CE MTC subframe separately from the location of the MBSFN subframe.
  • the information on the location of the CE MTC subframe may be transmitted to the CE MTC device through a master information block (MIB) or a system information block (SIB).
  • MIB master information block
  • SIB system information block
  • the information on the location of the CE MTC subframe may be represented in a 10-bit long bitmap format indicating the subframe used as the CE MTC subframe among the 10 subframes in the 10msec radio frame.
  • the information on the location of the CE MTC subframe may be expressed in a bitmap format of M-bit length indicating a subframe used as a CE MTC subframe among M MBSFN subframes in a 10msec radio frame.
  • the MTC device even when the subframe region in which the downlink data for the CE MTC device is transmitted consists of all or some subframes of the MBSFN subframe, the MTC device until the base station informs the location of the CE MTC subframe. It can be assumed that the location of the CE MTC subframe is the same as the location of the MBSFN subframe. Alternatively, the MTC device may assume that CE MTC subframes composed of all or some subframes of the MBSFN subframe are always in a fixed subframe region.
  • the CE MTC device may use all or some subframes of the MBSFN subframe as the CE MTC subframe only when one or more MBSFN subframes are configured from the base station.
  • a base station of a cell When a base station of a cell transmits downlink data for a CE MTC device on all or some subframes of an MBSFN subframe, a general PDSCH or a non-Physical Multicast Channel (PMCH) like a non-MBSFN subframe on the MBSFN subframe.
  • PMCH Physical Multicast Channel
  • the PDSCH can be transmitted on all possible OFDM symbols within the MBSFN subframe, similarly to the MBSFN subframe.
  • PDCCH may be transmitted only on up to two OFDM symbols. This is because, since the conventional general UE recognizes the corresponding subframe as the general MBSFN subframe, the base station of the cell recognizes that the PDCCH will be transmitted only on up to two OFDM on the corresponding subframe.
  • a base station of a cell transmits downlink data for a CE MTC device on all or some subframes of an MBSFN subframe
  • a normal CP or an extended CP is performed in all symbol regions within the corresponding subframe, such as a non-MBSFN subframe.
  • the base station of the cell transmits downlink data for the CE MTC device on all or some subframes of the MBSFN subframe
  • the MBSFN RS is not transmitted on the corresponding subframe
  • the CRS is transmitted like the non-MBSFN subframe. Can be.
  • a TM separate from a transmission mode (TM) used on a non-MBSFN subframe on the corresponding subframe can be used.
  • the TM used on the CE MTC subframe may always be used fixed to TM2.
  • the TM used on the CE MTC subframe may be known from the base station to the MTC device through MIB, SIB, and the like.
  • the CRS transmitted on the subframe differs from the CRS transmitted on the general downlink subframe.
  • the CE MTC device may perform the base station of the cell in the configured subframe and frequency / sub-band. It can be assumed that CRS is transmitted from.
  • CE MTC devices that can make this assumption may not support certain TMs, such as TM8, TM9, TM10, that perform data demodulation with DM-RS.
  • the current LTE-A system considers a technique for improving channel estimation performance of a general UE by performing power boosting of the CRS.
  • the remaining CRS may be transmitted at higher power without transmitting the CRS to some REs or RBs in which the CRS has been transmitted.
  • an embodiment may allow a base station to transmit a CRS only in the entire system band on the CE MTC subframe composed of all or some subframes of the MBSFN subframe, that is, some PRB regions of the entire PRBs.
  • the technique of transmitting the CRS only through some PRB regions on the CE MTC subframe including all or some subframes of the MBSFN subframe may be specifically as follows.
  • the CRS may be transmitted on only six PRBs out of the entire system band. Specifically, the CRS may be transmitted only on six PRBs or designated subbands among the CE MTC subframes configured as all or some subframes of the MBSFN subframe. In this case, the CRS may be transmitted with increased power. More specifically, the transmission power of the CRS may be increased by the number of times the total number of PRBs of the system band / PRBs of the subbands compared to the conventional.
  • the CRS may be transmitted only on 1/2 * PRB_S center PRBs.
  • the CRS may be transmitted only on six middle PRBs. In this case, the CRS may be transmitted with increased power. Specifically, the transmission power of the CRS may be doubled compared to the conventional.
  • CRS may be transmitted only through the even or odd PRB regions. More specifically, the CRS may be transmitted only on the even-numbered or odd-numbered PRB regions on the CE MTC subframe including all or some subframes of the MBSFN subframe. In this case, the CRS may be transmitted with increased power. Specifically, the transmission power of the CRS may be increased twice as much as before.
  • the CRS is not transmitted on all REs in the PRB in which the CRS is not transmitted. Instead, zero power transmission may be performed or PDCCH / EPDCCH / PDSCH may be transmitted on the RE location where the CRS should originally be transmitted in the PRB.
  • PDCCH / EPDCCH / PDSCH may be transmitted or zero power transmission may be performed where CRS should be transmitted. More specifically, zero power transmission may be performed at the position where the CRS should be transmitted in the OFDM symbol / PRB region in which the PDCCH or EPDCCH is transmitted.
  • the PDSCH may be rate-matched at the position where the CRS should originally be transmitted in the OFDM symbol / PRB region in which the PDSCH is transmitted.
  • the transmission power increase of the aforementioned CRS may be performed in REs except for the PDCCH region.
  • the CRS is transmitted as in the conventional system on the first 3 OFDM symbols, and in other regions, it is assumed that the CRS is increased with a predetermined power and transmitted. If this technique is used, it may be assumed that the existing UE does not perform QAM transmission. Therefore, it is not necessary to set the power ratio of CRS to PDSCH separately.
  • the base station sets the subframe as an MBSFN subframe to an existing UE, so that the base station is The existing UE may not receive the CRS transmitted with the increased power.
  • the transmission power increase of the CRS may be assumed to occur only on the MBSFN subframe from the point of view of the existing UE or may be assumed to be a subframe in which the existing UE is DRX. More specifically, this will be described with reference to FIG. 12.
  • a CRS is transmitted over the entire system bandwidth and a PDSCH / EPDCCH for a CE MTC device is transmitted on a CE MTC subframe including all or some subframes of a subframe. Only in the symbol region, the CRS may be transmitted only in some PRB regions of the PRBs of the entire system band. When the CRS is transmitted only on some PRB regions on the OFDM symbol on which the PDSCH / EPDCCH is transmitted, the aforementioned techniques may be applied in the same manner.
  • cell-specific or cell-common data for example, SIB of the first type
  • SIB for example, SIB of the first type
  • the second type of SIB may also be transmitted on the CE MTC subframe.
  • the base station may transmit cell-specific or cell-common data in two ways. First, the base station may transmit cell-specific or cell-common data for the CE MTC device separately from cell-specific or cell-common data for the existing UE. To this end, the base station may use other RNTIs.
  • a base station transmits cell-specific or cell-common data for a conventional UE in a general manner, and cell-specific or cell-common data for a CE MTC device located in an extended coverage area is used for the CE MTC device. It can be repeatedly transmitted in the subframes set for.
  • the CE MTC device should assume that a first type of SIB may be received on a CE MTC subframe, which is part of subframes previously known to not receive the first type of SIB.
  • the MTC device always receives cell-specific or cell-common data on a specific subframe among the CE MTC subframes. It can be assumed that For example, if six subframes are configured as CE MTC subframes within a 10 msec long radio frame, it may be assumed that a cell-specific PDSCH is always received on the first subframe among the six subframes.
  • the MTC device may assume that a first type of SIB is always received on a specific subframe among CE MTC subframes. If the specific subframes in which such cell-specific data is received are a subset of CE MTC subframes, only those subframes are a bundle of PDSCHs containing PDCCH and / or cell-specific data for cell-specific data. It can be used as. More specifically, when a corresponding set of subframes is determined, it may be assumed that a PDCCH including scheduling information of user-specific data or a PDSCH including data of an individual user does not come to the subframe.
  • the CE MTC device may assume that only USS exists in the CE MTC subframe, so that subframes configured for the CE MTC device may receive only individual user data. In this case, the CE MTC device may receive cell-specific or cell-common data only on subframes for the legacy UE. In addition, the MTC device may assume that only CSS is received on a non-MBSFN subframe.
  • the PRB region in which the PDSCH can be transmitted among the PRBs in this subframe is determined by the PDSCH on the general downlink subframe. It may be different from the PRB area that can be transmitted.
  • the base station may transmit the PDSCH for the CE MTC device only through a partial band region of the total downlink system bandwidth.
  • the PDSCH bandwidth can be one half of the total system bandwidth.
  • the PRB region in which the PDSCH can be transmitted may be as much as PRB regions in the center PDSCH band.
  • the PDSCH may be transmitted in some PRB region, so that the PDSCH may be transmitted at greater power than that transmitted in the non-MBSFN subframe.
  • a PDSCH on a CE MTC subframe may be transmitted at twice the power per RE than a PDSCH on a non-MBSFN subframe.
  • the CE MTC device will be described below only on the CE MTC subframe (or MBSFN subframe). Assume a situation of receiving a control channel / data channel of a user.
  • the location of the CE MTC subframe may be denoted D i .
  • i 0, 1, ... N D.
  • the subframes of the CE MTC device can transmit the ACK / NACK for the data channel of the individual user The location can be determined.
  • the location of the sub-frame that is MTC CE device to send the ACK / NACK may be a D i +4.
  • the CE MTC device transmits ACK / NACK within each 10 msec radio frame.
  • a value of G i for determining the location of subframes in which the CE MTC UE can transmit ACK / NACK may be determined as shown in Table 2 below. Table 2 below shows values of G i according to position D i of the CE MTC subframe according to the TDD UL-DL configuration.
  • the positions of the subframes through which the CE MTC device can transmit ACK / NACK are subframes 2 and 7. Therefore, after the reception of the PDSCH, the MTC device may repeatedly transmit the ACK / NACK through the subframe 2 and the subframe 7 positions from the subframe position where the ACK / NACK transmission can be started.
  • the CE MTC device may transmit ACK / NACK information for the corresponding PDSCH on the plurality of subframes.
  • the CE MTC device transmits ACK / NACK from the 'subframe n + G' (ie, N A ). Can be transmitted on the subframe of.
  • the CE MTC device may transmit ACK / NACK for the corresponding PDSCH on 'subframe n + G * a'.
  • a 0, 1,... , N A may be.
  • the value of G may be determined by Table 2 above. In the above, G and D correspond to Gi and Di in Table 2, respectively.
  • CE MTC subframe is always set equal to the MBSFN subframe, or when the CE MTC subframe is defined as a subset of all or a portion of the MBSFN subframe, the CE MTC device is referred to as a CE MTC subframe (or MBSFN subframe). Assume a situation in which a control channel / data channel of an individual user is received only on a frame).
  • the position of the subframe to the MTC CE device transmitting a PUSCH may be a D i +4.
  • the CE MTC device transmits a PUSCH within each 10 msec long radio frame.
  • the location of subframes that can be determined may be determined by (D i + K i ) mod 10.
  • K i may be determined according to Table 3 below.
  • Table 3 below shows values of K i according to the position D i of the CE MTC subframe according to the UL-DL configuration.
  • the MTC device determines a subframe for transmitting the PUSCH. In doing so, the position of the corresponding subframe may be excluded.
  • the position of the subframe where the PUSCH can be transmitted can be calculated as follows.
  • the CE MTC device After the CE MTC device receives the PDCCH including the uplink grant, the positions of the subframes capable of transmitting the PUSCH are subframes 2, 7, and 8. In conclusion, after all of the reception of the PDCCH, the CE MTC device transmits a bundle of PUSCHs on subframes 2, 7, and 8.
  • the base station may also repeatedly transmit the PBCH on the plurality of subframes for the CE MTC device. Specifically, this will be described with reference to FIG. 14.
  • a conventional PBCH is transmitted through subframes 0, 10, 20, and 30 for 40 msec, whereas a bundle of PBCHs repeatedly transmitted on a plurality of subframes according to an embodiment of the present specification. May be transmitted on all subframes for 40 msec.
  • a bundle of PBCHs may be transmitted on a plurality of subframes for an MTC device located in a coverage extension area.
  • the PBCH may be repeated only on some subframes within the 10 msec radio frame as shown in FIG. 14B in consideration of a resource area of the existing general UE.
  • subframes transmitted by the silence of the PBCH for the CE MTC device are subframe areas for transmitting downlink data for the CE MTC device. It may be the same as the CE MTC subframe.
  • subframes other than subframe 0, for example, subframes 2, 3, 6, 7, and 8 of FIG. 14B may indicate downlink data for a CE MTC device. It may be the same as the CE MTC subframe, which is a subframe region to be transmitted.
  • the bundle of PBCHs for the CE MTC device except for the PBCH transmitted in subframe 0 may be transmitted only on all or some subframes of the MBSFN subframe.
  • the CE MTC UE does not need high data rate or operates in a low SNR region, so channel estimation performance may not be good enough to use two or more RS antenna ports. Can be.
  • the MTC device may have low mobility, and the channel environment of the MTC device may be an environment having very little diversity. Therefore, it may be an inefficient operation for the cell base station to transmit data to the MTC device using a plurality of antenna ports.
  • a resource region (that is, a bundle of PBCHs) for transmitting a bundle of additional PBCHs for a CE MTC device is transmitted.
  • the number of antennas used to transmit the additional PBCH bundle can be reduced without increasing the number of antennas.
  • the resource region (that is, the additional PBCH bundle is transmitted) Only one antenna port may be used to transmit an additional PBCH for the CE MTC device and CRS on a transmitted subframe or a CE MTC subframe. In this case, the antenna port may be an antenna port 0.
  • the antenna port may be an antenna port 0.
  • Good performance channel estimation is very important for MTC devices located in extended coverage areas.
  • One of the methods for improving the channel estimation performance of the MTC device is to increase the density of the RS used for channel estimation.
  • a subframe in which additional PBCH bundles and / or PDSCHs are transmitted only for CE MTC devices.
  • the number of antenna ports used for transmitting the bundle and / or PDSCH of the corresponding PBCH may be limited.
  • additional PBCH bundles and / or PDSCHs are transmitted for CE MTC subframes or CE MTC devices.
  • CRS CRS
  • 15 is an exemplary diagram illustrating a resource for transmitting a CRS.
  • each number denoted by RE represents the number of the antenna port.
  • FIG. 15A illustrates an example in which a CRS is transmitted on a radio resource grid using a normal CP
  • FIG. 15B illustrates an example in which a CRS is transmitted on a radio resource grid in which an extended CP is used.
  • an existing CRS is transmitted on an RE denoted by antenna ports 0, 1, 2, and 3
  • antenna ports 0, 1, 2, and 3 a bundle of additional PBCHs for a CE MTC subframe or a CE MTC device and In the time / frequency resource region in which the PDSCH is transmitted
  • the CRS to be transmitted on the RE denoted as antenna ports 0, 1, 2, and 3 may be transmitted using antenna port 0.
  • the CRS transmitted to antenna port 0 may be transmitted.
  • the number of REs will increase.
  • only the antenna port 0 may be used in the corresponding region to transmit silence and / or PDSCH of the PBCH to the CE MTC device.
  • Embodiments of the present invention described so far may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof. Specifically, it will be described with reference to the drawings.
  • 16 is a block diagram illustrating a wireless communication system in which the present disclosure is implemented.
  • the base station 200 includes a processor 201, a memory 202, and a radio frequency unit 203.
  • the memory 202 is connected to the processor 201 and stores various information for driving the processor 201.
  • the RF unit 203 is connected to the processor 201 to transmit and / or receive a radio signal.
  • the processor 201 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 201.
  • the MTC device 100 includes a processor 101, a memory 102, and an RF unit 103.
  • the memory 102 is connected to the processor 101 and stores various information for driving the processor 101.
  • the RF unit 103 is connected to the processor 101 and transmits and / or receives a radio signal.
  • the processor 101 implements the proposed functions, processes and / or methods.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé d'émission/réception destiné à un appareil pour communications de type machine (MTC). Le procédé d'émission/réception pour l'appareil MTC peut comporter les étapes suivantes: l'appareil MTC reçoit des informations de réglages concernant une sous-trame de réseau à fréquence unique de diffusion groupée-diffusion générale (MBSFN) en provenance d'une station de base; l'appareil MTC reçoit des données de liaison descendante destinées à l'appareil MTC, sur une région de données de la sous-trame de MBSFN; et l'appareil MTC reçoit un signal de référence spécifique à une cellule (CRS) uniquement sur une partie des blocs de ressources (RB) de la totalité de la bande passante du système dans la région de données dans la sous-trame de MBSFN. Ici, le CRS reçu uniquement sur la partie des RB peut être émis tandis que la puissance électrique est accrue au moyen de la station de base.
PCT/KR2014/005950 2013-07-26 2014-07-03 Procédé d'émission/réception pour appareil mtc WO2015012507A1 (fr)

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US16/447,523 US10863320B2 (en) 2013-07-26 2019-06-20 Transmission/reception method for MTC apparatus

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US201361858629P 2013-07-26 2013-07-26
US61/858,629 2013-07-26
US201361866551P 2013-08-16 2013-08-16
US61/866,551 2013-08-16

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US16/447,523 Continuation US10863320B2 (en) 2013-07-26 2019-06-20 Transmission/reception method for MTC apparatus

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US10375529B2 (en) 2019-08-06
US20190306669A1 (en) 2019-10-03
US20160174014A1 (en) 2016-06-16

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